# Oscillations and Waves (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 166 - 170 of 195

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## Question number: 166

» Oscillations and Waves » Doppler Effect in Sound

MCQ▾

### Question

A whistle sends out 210 waves in a second. If the whistle approaches the observer with velocity 1/4 of the velocity of sound in air, the number of waves per second the observer will receive

### Choices

Choice (4) Response

a.

384

b.

320

c.

182

d.

280

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## Question number: 167

» Oscillations and Waves » Doppler Effect in Sound

MCQ▾

### Question

A source of sound of frequency n is moving towards a stationary observer with a speed S. If the speed of sound in air is V and the frequency heard by the observer is n 1, the value of is,

### Choices

Choice (4) Response

a.

b.

c.

d.

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## Question number: 168

» Oscillations and Waves » Doppler Effect in Sound

MCQ▾

### Question

A source of sound emitting a note of frequency 200 Hz moves towards an observer with a velocity v equal to the velocity of sound. If the observer also moves away from the source with the same velocity v, the apparent frequency heard by the observer is,

### Choices

Choice (4) Response

a.

200 Hz

b.

100 Hz

c.

150 Hz

d.

50 Hz

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## Question number: 169

» Oscillations and Waves » Standing Waves in Strings and Organ Pipes

MCQ▾

### Question

The frequency of fundamental tone in an open organ pipe of length 0.48 m is 320 Hz. Speed of sound is 320 m/sec. Frequency of fundamental tone in closed organ pipe will

### Choices

Choice (4) Response

a.

143.2 Hz

b.

320.0 Hz

c.

153.8 Hz

d.

160.0 Hz

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## Question number: 170

» Oscillations and Waves » Doppler Effect in Sound

MCQ▾

### Question

A police car moving at 22 m/s, chases a motorcyclist. The police man sounds his horn at 176 Hz, while both of them move towards a stationary siren of frequency 165 Hz. Calculate the speed of the motorcycle, if it is given that he does not observes any beats

### Choices

Choice (4) Response

a.

33 m/s

b.

Zero

c.

11 m/s

d.

22 m/s

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